Vacuum-bonnet.



J. H. BOYD.

VACUUM BONNET.

APPLICATION FILED IULY 6.1918.

1,298,446. I Patented Hana 25,1919.

W/T/VESSES' UVVE/VTOI? v. k/fifio 62 ZMZi/iJUXV/QML q Arm/Wm To all whom it concern:

TAT ATENT Joint H. orn, F MOUNT VERNON, NEW YORK.

VACUUM-BONNET.

meagre.

Mount Vernon, in-the county of Westchesj ter and State of New York, have invented a new and I proved Vacuum-Bonnet, of which the' fol owing is a full, clear, and

i exact description.

a removable. bonnet or cap for a radiator 'Thislinvention relates to heating appliances and has for an object the provision of an improved construction used in connection with a radiator or a radiator valve whereby the air may-freely be exhausted, but no air ma be drawn in. 1

. nother object in view. is the provision of valve formed with a spring seated structure which will become unseated for releasing air' when the steam pressure brings the air under pressure, but it will automaticall reseat itself when the steam pressure has een reduced to a certain extent.

In the accompanying drawing:

Figure 1 is a side view of a radiator ai valve with an embodiment of the invention shown applied thereto. f Fig. 2 is a section through Fig. 1 on line 22.

Referring to the accompanying drawing by numerals, 1 indicates an ordinary air valve provided for most radiators now in use which isintendedto allow the air to escape as the steam pressure rises, but to close when the steam attempts to escape. This construction when in proper working order will accomplish the result aimed at,

- namely the releasing of the air and the corn fining of the steam, but when the steam pressure has been reduced the valve mechanism will automatically open and consequently air will be drawn again into the radiator. To heat a radiator supplied with air an appreciable pressure of steam must be provided above atmospheric pressure in order to driveflout the air so that the steam may contact with all parts of the radiator. If

air is prdvented from entering the radiator the vacuiim produced therein by a decrease in' pressure of the steam will cause the hot vapors to pass upwardly from the steam boilerintothe radiator andmaintain the radiator in' a heated condition even though the vapors or steam are below atmospheric pressure. In order to assist in accomplishmg the desired resultssuggested a bonnet is Y providedfor the valve 1 which is constructed Specification of Letters Patent.

Patented Mar. 25, 1919.

Application filed-July 6, 1918. Serial No. 243,717.

with a tubular casing 2 having a closed upper end 3, which maybe rounded as shown in the drawing, and the lower end -i formed with a valve seat 5 and a threaded extension 6 adapted to be screwed over the threaded end of valve 1. An opening 7 is provided so that air or steam escaping from valve 1 will pass into the casing2 and from thence out the discharge opening or vent 8. A valve member 9 is provided in casing 2, said valve member consisting of a washer 10 and a plate 11, said plate being provided with a screw 12 which connects the lower end of the springj13 with the valve member 9 while the opposite end presses against the closed end 3 of casing 2. This spring is comparativelv light, though of an appreciable length to allow a considerable movement of the valve member 9 without an appreciable varipart of the spring is tubular so that the 1 sure to a greater or less extent and as the pressure increases the air will escape through valve 1 and will raise valve member 5) to a greater or loss extent so as to escape through the vent 8.. If the valve 9 is out of order steam will pass therethrough and also out through vent 8 as the vacuum bonnet provided in the invention is not intended to prevent the escape of steam or air, but as the steam reaches atmospheric pressure plate 11 will cause valve 9 to close so that no air can enter the radiator. In this way means are positively provided which will permit the air to escape or even steam to escape, but will not allow air to enter again into the radiator. The valve member 9 in casing 2 always closes in advance of the automatic opening of air valve 1 thereby causing a perfeet vacuum in the radiator and also in the system.

What I claim is 1. A vacuum bonnet for radiators comprising a casing, means for connecting the casing with a radiator so that air maypass from th e radiator into the casing, said casing having a vent whereby said air will pass out of said casing, a valve member arranged between the vent and the means for connecting the casin with the radiator, and a spring guided by t e casing acting on said valve for normally closing thevalve, said spring having a conical shaped end connected to said valve whereby the valve is permitted a and a valve member connected W1th the cone sha said seat, said valve member closing said inlet opening under the action of said spring.

3. Avacuum bonnet for radiator valves comprising a tubular casing closed at one end, a connectin nipple secured to the opposite end, said connecting 'nippl e having an internally threaded extension merging into a passageway which opens intosaid casing, sald casing having a vent, a valve member normally closing said passageway,'said valve member closing over said passageway and away from the vent, and a spring guided by the casing acting on said valve member, said spring being of a strength to close the valve member when the pressure on each side thereof is substantially; equal.

JOHN H. BOYD section of said spring coacting with 

